$ git clone -n https://github.com/xcp-ng-rpms/varstored.git /var/lib/mock/v8.3-u-stormi2-9559-28306/root/chroot_tmpdir/scmroot/varstored
Cloning into '/var/lib/mock/v8.3-u-stormi2-9559-28306/root/chroot_tmpdir/scmroot/varstored'...
$ git fetch origin 3186e566a41dee0dec0001d07823f75fe6c647ac:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/varstored
 * [new ref]         3186e566a41dee0dec0001d07823f75fe6c647ac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3186e56 bump release for test build